They do have meetings at IHQ but they also meet at other places throughout the year. It depends on conferences, etc in their schedule. They meet about 4 times a year and then have conference calls, faxing , emails, etc. Most of them work and have families, plus they are in different time zones, so technology has really helped!
I hope that helps with the how it all works. I know it can be confusing but really just think of it as IC makes the decisions and IHQ is the business office.